UL 1449 3rd Edition
♦ Creates SPD types
♦ New Nominal Dis charge Surge Current test, In
“stress” test
♦ Declare MCOV per mode
♦ SVR 6kV, 500A replaced with VPR (Voltage
Protective Rating) 6kV, 3kA
♦ Surge Arrestor incorporated into UL1449 as Type
1 device
1
Competitors Surge Arrestor
Our Surge Arrestor
SPD Types - UL 1449, 3 rd Edition
Type 1 SPD
Permanently Connected SPD –
Installation between the secondary of
the service transf ormer and the LINE
side of the service disconnect over
current device, as well as the LOAD
side, including watt-hour meter
socket enclosures. (Not exceeding
1000V):
2
SPD Types (Continued)
Type 2 SPD
Permanently Connected SPD intended for installation on the
LOAD side of the service disconnect over current device;
including SPDs located at the branch panel.
3
SPD Types (Continued)
Type 3 SPD
Point of utilization SPDs, installed a minimum of 10 meters
(30 feet) from the electrical service panel, for example cord
connected, direct plug-in (DPI), receptacle type and SPDs
installed at the utilization equipment being protected.
4
SPD Types (Continued)
Type 4 SPD
Component SPDs, including discrete components as well
as component assemblies.
(Note: as proposed the 3rd Edition will allow Type 4 SPDs to be
tested and applied where T ypes 1 and 2 are allowed)
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Measured Limit ing Voltage Test
(MLV)
♦ All SPD Types are to be tes ted to 6kV/3kA - 3
pulses per mode with applied voltage. VPR
(Voltage Protection Rating) is determined by
averaging results. (Per 34.9 and Table 34.1)
♦ SVR was 6kV/500A
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Nominal Discharge Current Test
(In)
♦ Nominal Discharge Current Test has been established to
ensure product integrity by exposing the SPD to repetitive
surges and over voltage conditions to determine if significant
degradation or failure will occur. The before and after VPR test
results cannot vary by more than 10%.
♦ Stress test to optimally test coordination between integrally
designed disconnecting means and surge components.
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Nominal Discharge Current Test
(In)
♦ Type 1:
10kA or 20kA/Mode
♦ Type 2:
3kA, 5kA, 10kA, or 20kA
♦ 15 pulses per MODE with MCOV applied no more than one
second after pulse.
♦ Pulses to be done in groups of 5 with a 30 minute rest in
between each group. OCP shall not open. Sample must be
functional.
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Nominal Discharge Test
3 Pre VPR shots Average and 3 Post VPR shots average can not deviate by more than 10%
The MCOV value of an SPD is now a tested value
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In Test for Type 3 and 4
devices Duty Cycle Test
♦ Type 3 and Type 4: Operating Duty Cycle at
6kV/3kA. 15 Surges per mode with applied
voltage. OCP (Over Current Protection Device)
shall not open.
♦ Easier to pass than the In tes t.
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Internal or External
♦ Do Internally mounted SPDs have shorter lead
lengths?
♦ Lead length is determined by the overall length of
a mode, to include length of phase connection
PLUS the length of Neutral and Ground
connections .
♦ Internally mounted SPDs have very short phase
connections , but have long Neutral and Ground
connections .
11
A properly
installed side
mounted SPD
can have a
shorter system
lead length than
an internally
mounted SPD
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Upstream Over Current Protection
♦ Does a breaker upstream of an SPD limit the
effectiveness of the SPD?
♦ Breakers have trip values and failure values
Trip kA
CB Pulse Performance
Fail kA
160
These values are based on testing
performed by Current Technology’s
Surge generator on commercially
available off the shelf breakers.
140
Pulse kA
120
100
80
60
A 30A breaker will trip when
subjected to a 64kA surge
40
20
0
15
30
40
60
100
CB Rating
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Examples of Installations
Type 1 SPD
♦
♦
♦
♦
Type 2 SPD
♦ 200kA per mode SPD
200kA per mode SPD
♦ Surge Rated Integral Disconnect
Surge Rated Integral Disconnect
♦ Installed on load side behind a
Installed on line or load side of main
30 Amp breaker
Surge Rating of Installed system =
♦ Surge Rating of Installed system =
200kA per mode
64kA per mode
♦ Installed on load side behind a
60 Amp breaker
♦ Surge Rating of Installed system =
82kA per mode
♦ Installed on load side behind a
100 Amp breaker
♦ Surge Rating of Installed system =
140kA per mode
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Specification Updates
♦ Must require 3rd Edition listed products
♦ Must require the service entrance protector be a Type1
SPD to maximize installation capabilities
♦ Must require all other SPDs to be Type2 SPDs
♦ Must require the In rating be 20kA for Service Entrance
and 20kA or 10kA for downstream panels.
♦ Must require that the MCOV value be derived from the In
test and not be a calculated or claimed figure.
♦ Must reflect VPR clamping levels and not SVR clamping
levels
♦ Replace the word “TVSS” with “SPD”
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Specification Updates
Continued
♦ Must not require a surge limiting upstream over
current protection device
♦ Must not require the SPD be integrally mounted
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